Using Calc/charts, how can I have the chart draw a straight line across the chart from a number in location B2 for example

I’m charting medical test results and most tests have a high and low range.

I want the chart to show a straight line across the entire chart from data in B2/B3 for the normal high and low ranges.

Hello,

Please try to keep main question short if possible.

Also, deleted my answer as I did not correctly read the question.

Sorry for the long question - my first time!

Something like the attached sample? I added helper columns for the max and min ranges and used a Column and Line chart with two lines.

lined_chart.ods

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Thanks for the reply. Never thought of that. I was hoping for an easier way but your way will work. Thanks again.